1999 Buick Riviera Wheel Interchange
tl;dr
Buick Riviera 1999 has bolt pattern 5x115, center bore 70.3 mm, and lug thread M12 x 1.5. Rim diameter, rim width, offset, backspacing, and tire sizes are not provided here. Use the on-page calculator and OEM sources to confirm those unknowns before buying wheels or tires.
Recommendation
Start by confirming the missing wheel and tire dimensions. Use the vehicle placard, owner’s manual, dealer fitment, or physically measure your current wheels and tires. Then use the on-page calculator to compare donor wheels to your Riviera and to test custom wheel and tire combinations. If you buy wheels, match the bolt pattern and center bore, and verify lug-nut seat type and thread are compatible with M12 x 1.5.
Impact
Correctly matched wheels preserve steering, handling, and safety. Proper center bore and bolt pattern ensure wheels mount concentrically and securely. Right rim width and offset keep fenders clear and maintain steering geometry. Incorrect choices cause rubbing, altered vehicle dynamics, or premature wear.
Risks
- Hub-centric mismatch can cause vibration if center bore is not addressed.
- Wrong offset or width may cause tire rub or suspension interference.
- Using incorrect lug-nut seat or thread risks stud damage or wheel loss.
- Spacers or adapters introduce extra failure points and require grading.
- Tire diameter changes can affect speedometer and ABS calibration.
Next actions
Follow this checklist to finish fitment safely and quickly.
- Check the vehicle placard or owner’s manual for OEM rim and tire specs.
- Measure your current rim diameter, rim width, and backspacing if unknown.
- Use the on-page calculator: compare donor vs installed, and test custom sizes. The calculator updates tire diameter when rim diameter changes.
- Confirm lug nut seat type and torque spec with OEM sources or service manual. Thread size is M12 x 1.5 for the Riviera.
- If center bore is larger than wheel bore, use hub-centric rings sized to 70.3 mm for proper centering.
- Before final installation, do a trial mount, torque lug nuts to spec, and road-test checking for vibration or rubbing.
Checklist gotchas: do not assume wheels are hub-centric just because bolt pattern matches. When specs vary by trim, consult the calculator and OEM sources to confirm fitment for your exact Riviera configuration.
Tools and parts you may need: torque wrench, hub-centric rings, correct-seat lug nuts. Search examples:
Reference table
| Item | Value |
|---|---|
| Bolt pattern | 5x115 |
| Center bore | 70.3 mm |
| Thread size | M12 x 1.5 |
| Rim diameter | Unknown – confirm with placard or measure |
| Rim width | Unknown – confirm with measurement or OEM data |
| Offset (ET) | Unknown – use calculator to test options |
| Backspacing | Unknown – measure if needed |
| Tire sizes | Unknown – verify placard or use calculator for swaps |
Next steps resolved: gather the missing dimensions, run comparisons in the calculator, and confirm lug-seat and torque specs with OEM documentation. Follow the checklist and safety items before driving on new wheels.
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